Multiple filament lamp combination



Nov. 26, 1940. J, DULBERG 2,222,655

MULTIPLE FILAMENT LAMP COMBINATION Filed April 18, 1958 2 Sheets-Sheet l a INVENTOR Z Z4 Z3 Z5 ms/ 5 Dl/LBER6 AT ORNEY Nov. 26, 1940. J DULBERG 2,222,655

MULTIPLE FILAMENT LAMP COMBINATION Filed April 18, 1958 2 Sheets-Sheet 2 Zr? I Z 32 9 35 39 4a 36 8 35 M INVENTOR. Magma? fiulber ATTORNEY.

Patented Nov. 26, 1940 UNITED STATES PATENT OFFICE Application April 18,

2 Claims.

The invention herein disclosed relates to multiple filament lamps, particularly those of the type covered in Dulberg Patent 2,082,326 and patent application Ser. 189,956.

Objects of the invention are to provide a practical and inexpensive multiple filament lamp structure adapted for use in any ordinary lamp socket and more particularly to arrange the base and filament switch mechanism for the lamp in the form of a unit adapted for mounting in an ordinary lamp socket and which is separable from the lamp itself, thus being in the nature of an adapter engageable in the lamp socket and adapted to receive a multi-filament globe.

Further objects and the novel features of construction, combinations and relations of parts by which all objects are attained are hereinafter set forth or will appear in the course of the following specification.

The drawings accompanying and forming part of the specification illustrate a practical commercial embodiment of the invention.

The structure however may be modified and changed in various ways all within the true intent and broad scope of the invention as hereinafter defined and broadly claimed.

Fig. 1 is a broken part sectional View of the complete lamp combination.

Fig. 2 is a view of the socket end of the adapter as separated from the lamp globe.

Fig. 3 is a broken sectional detail substantially on the line 33 of Fig. 2.

Fig. 4 is a broken cross-sectional view on substantially the plane of line 4-4 of Fig. 1, omitting the screw shell terminal.

Fig. 5 is a cross-sectional view as on substantially the line 55 of Fig. 1.

Fig. .6 is a diagrammatic view of the parts in the position indicated in Fig. 1 and showing how in such position the filament i3 will be illuminated.

Fig. '7 is a similar view showing how with the socket portion turned one step to the right, the filament l2 will be illuminated.

Fig. 8 is a diagrammatic view illustrating the switch mechanism turned to the third position to accomplish illumination of both filaments.

The present invention, as in the prior Dulberg patents, comprises the equivalent of a two part lamp base, one part designated l0, carrying the lamp globe I I, with the series connectedfilaments I2, l3, and having screw ring l4, engaging screw socket l5, in said base part [0. This globe further is shown as having center contact [6, and end ring contact H. The filaments are indicated as connected together and as connected by a common supporting connection It, to screw terminal l4, and with the outer end of filament it, connected by support IS, with center contact 1938, Serial No. 202,587 (01. 173 348) it, and the outer end of filament l2, connected by support 20, with the ring terminal ll.

The first lamp base part 10, is shown as having a reduced end portion 2!, opposite the socketed end which receives the screw base of the bulb as mounting the second base part carrying the screw shell contact terminal 22, and center lamp contact 23. This center contact is shown as a contact head on the outer end of the stud 24, fixed in the first base part. A spring 25, between this contact head and the insulating disc 25, closing the end of the screw shell contact 22, provides constant electrical connection between said contact head and the center contact bushing 2i, seated in said insulating disc. This center bushing is shown extended and inclined in Figs. 1 and 5, to constitute an elongated contact. Similar elongated inclined contacts 23, are shown set in the face of the insulating button 26, secured as by eyelets 30, in electrical connection with the surrounding screw shell contact 22.

Loosely mounted on the stud 24, between the two relatively rotatable base members and 2G, is shown an insulating disc 3|, carrying spaced inclined contact arms 32, 33, 34, for engagement with inclined contacts 27, 28, 29. These intermediate contacts are shown as secured on the insulating carrier 3|, by studs 35, 3G, 37, surrounded by springs 38, and projecting into tubular eyelets 39, 40, 4|, in the first base member ID. The tubular rivets or eyelets 39, til, 4!, project up into the socketed end of the base part and secure in place the spring contact 42, for engaging center contact l6, of the bulb, the spring contact 43, for engaging the end contact ring l1, and the angled lug 44, at the base of the shell contact 15, respectively.

The lamp base attachment or adapter body is shown as having an extended end flange 45, lined or roughened at 46, to provide a firm grip for the fingers.

The two relatively rotatable parts of the base structure are coupled in non-rotative relation in the illustration by having the screw shell part 22, notched at 41, Fig. 1, to receive lugs 48, on the other part. This coupling however, may be disengaged by pulling the first base part outwardly in respect to the second part against the tension of spring 25, sufiiciently to release the lugs 48, from notches 41.

The adapter can be used in any ordinary lamp socket and, combined as indicated with a double filament lamp, be employed to select either one or the other, or both filaments in parallel, thus to give three degrees of illumination. With the three contact form of lamp screwed in the socket of the adapter as in Fig. l, the inner ends of the two filaments will be connected at 18, with the socket shell I5, of the adapter and the outer ends be connected with contacts 42, and 43. From these, current is conducted to the spring contacts or brushes 34, 32 and 33, on the front fioating contact carrier 3|. In the relation shown in Figs. 1 and 6, with brush 34, in engagement with contact 28, and brush 32, in engagement with contact 21, and brush 33 in engagement with contact 29, only the filament I3 will be illuminated, the circuit then being from center contact 23, 24, through spring 25 and contact 21, brush 32, spring 38 and tubular eyelet 39, spring 42, center contact I6, conductor I9, filament I3 and conductor I8 to screw shell I4, screw socket I5, eyelet 4|, brush 34 and contact 28 to the screw shell terminal 22. In this position, the filament I2 while actually in circuit, through the return path 20, 43, 40, 33, 29, does not become illuminated because the resistance of such filament is such as to cause the current to return through low resistance return path I8, etc., for filament I3. With partial relative rotation of the lamp base parts to the pdsition shown in Fig. 7, to carry brush 32, off contact 21 and snap it into engagement with contact 28, filament I3 will cease to be illuminated and in the same movement, filament I2 will be cut in full circuit by brush 33, which through eyelet 40 and spring 43, Fig. 3, connects with the terminal ring I1. From this point the fiow is through support 20, filament I2 and low resistance return through support I8, screw shell terminals I4, I5, eyelet 4|, brush 34, and contact 29, connected with screw shell terminal 22.

With the next step of relative rotation Fig. 8, the brush 34, which through the eyelet 4|, is connected with the screw shell I5 and hence with the screw contact I4, of the lamp globe, by engagement with contact 21, establishes current flow through the center connection I8 to the two filaments I2, I3. At such time, the other two brushes 32 and 33, will be in engagement respectively with contacts 29 and 28, connected with the screw shell terminal 22, so both filaments I3 and I2, will then have low resistance return connections to the screw shell terminal 22.

The two relatively rotatable parts of the adapter are normally coupled at 41, 48, so that the adapter may be readily screwed into or out of a current supply socket. The spring 25, Fig. 1, which normally holds these parts interlockingly engaged, is readily yieldable to permit the upper or socket portion of the adapter to be pulled out far enough to release lugs 48, from notches 41, whereupon the upper socket portion may be turned one or more steps and dropped back into interlocked engagement again. These same adjustments can be efi'ected with or without the lamp in place in the adapter. The adapter therefore may be considered and used either as an attached part of the lamp or as a wholly separate unit to be inserted in a lamp socket or to be applied to a lamp globe, whenever required. The detachability of the supporting base and switch mechanism is particularly desirable as affording a structure separate from the filament carrying portion and which may be used with new lamps indefinitely as filaments burn out or lose efiiciency. In addition to its particular utility in connection with or part of multifilament lamps, the adapter may be used also with single filament lamps. Thus if a multiple filament lamp should burn out and no other such lamp be immediately available, lighting service may be maintained by simply screwing an ordinary single filament lamp in the socket of the adapter. The two relatively rotatable parts of the adapter constitute a two part lamp base extension with the lower, outer, exposed plug portion carrying the screw shell and center lamp terminal elements and the upper portion carrying the three contact terminals for the double filament lamp inserted or to be inserted therein.

What is claimed is:

1. An adapter, comprising plug and socket portions connected in coaxial relatively rotatable relation, screw shell and center plug contacts on said plug portion, screw shell and center socket contacts on said socket portion, relatively rotatable and axially yieldable switch contacts between said relatively rotatable plug and socket portions and yieldingly connected with both said plug portion and said socket portion contacts, there being three switch contacts carried by said plug portion and three coacting similarly positioned switch contacts carried by said socket portion, said switch contacts being always in engagement but in different relations in the three possible relatively rotated positions of the plug and socket portions, two of the switch contacts carried by the plug portion being connected with one of the contacts of that portion and the other of such switch contacts being connected with the other contact of said plug portion, the socket portion having a lamp contact in addition to said screw shell and center contacts and the three switch contacts carried by said socket portion being connected with said three contacts on said socket portion, and an exposed switch operating ring of insulating material projecting from said socket portion and forming a handle for rotating said socket portion in respect to said plug portion for effecting operation of said switch contacts.

2. An adapter, comprising plug and socket portions connected in coaxial relatively rotatable relation, screw shell and center plug contacts on said plug portion, screw shell and center socket contacts on said socket portion, relatively rotatable switch contacts between said relatively rotatable plug a-nd socket portions and connected with said plug portion and said socket portion contacts, there being three switch contacts carried by said plug portion and three coacting similarly positioned switch contacts carried by said socket portion, said switch contacts being always in engagement but in different relations in the three possible relatively rotated positions of the plug and socket portions, two of the switch contacts carried by the plug portion being connected with one of the contacts of that portion and the other of such switch contacts being connected with the other contact of said plug portion, the socket portion having a lamp contact in addition to said screw shell and center contacts and the three switch contacts carried by said socket portion being connected with said three contacts on said socket portion, and an exposed switch operating ring of insulating material projecting from said socket portion and forming a handle for rotating said socket portion in respect to said plug portion for efiecting operation of said switch contacts and a floating support for enabling relatively axial movements in both directions as well as rotative movements of said switch contacts.

JASPER DU'LBERG. 

